Warrant The Current Debate by Alvin Plantinga is the first in the author's trilogy on subject of warrant. This first instalment surveys current thoughts on knowledge and sets the stage for Plantinga to lay out his view in Warrant and Proper Function. It is then applied to theistic belief in Warranted Christian Belief. Plantinga a leading contemporary philosopher in the fields of epistemology and the philosophy of religion.
This is an extensive and comprehensive overview of historic and contemporary views on knowledge. It covers the leading thinking and concepts in this area; Chrisholm, Alston, Bonjour etc. and even a nice discussion of Bayesian probability. The presiding definition of knowledge is `justified true belief' - with perhaps some caveats to account for Gettier-like problems. Discussion of this understanding is usually centered on issue of justification, i.e. what in addition to true belief is required to constitute knowledge. Plantinga uses warrant more or less synonymously with justification and seeks to understand how it might be achieved.
I am a fan of Plantinga, I find him to be a rare intellectual; brilliant, humble and witty. I did, however, have a couple of minor quibbles with the book. First, with respect to the physical book itself, I'm not sure exactly what it was, perhaps the font or the construction (or maybe my failing eyesight) - but, I thought the layout was less than ideal for this type of dense subject-matter. Anyways, relatively minor stuff. The other criticism regards the flow, the front end of the book felt a bit choppy. Granted the text is written for an audience within a level of background knowledge, however I thought a clearer description of the different understandings of internalism and externalism would have been helpful and, not a big cost for a trilogy such as this.
Overall, this is a tremendous series which makes an important contribution. I highly recommend it for readers interested in epistemology. Of the three books in the series this is probably the narrowest in appeal. If you are just going to read one Warranted Christian Belief is probably your best bet.